app/views/shared/_nav_js.html.erb
<div class="mdl-layout__drawer">
<span class="mdl-layout-title">Redeemify</span>
<nav class="mdl-navigation">
<a class="mdl-navigation__link" href="/">Home</a>
<a class="mdl-navigation__link" href="#">About</a>
<% if current_user %>
<a class="mdl-navigation__link" href="/logout">Logout</a>
<% end %>
</nav>
</div>